CN112358013A - Solar electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function - Google Patents
Solar electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function Download PDFInfo
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- CN112358013A CN112358013A CN202010952225.2A CN202010952225A CN112358013A CN 112358013 A CN112358013 A CN 112358013A CN 202010952225 A CN202010952225 A CN 202010952225A CN 112358013 A CN112358013 A CN 112358013A
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- 238000005189 flocculation Methods 0.000 title claims abstract description 73
- 230000016615 flocculation Effects 0.000 title claims abstract description 71
- 238000004062 sedimentation Methods 0.000 title claims abstract description 71
- 239000010865 sewage Substances 0.000 title claims abstract description 62
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 230000002441 reversible effect Effects 0.000 claims abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 32
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 25
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 25
- 239000011574 phosphorus Substances 0.000 abstract description 25
- 229910052742 iron Inorganic materials 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- -1 iron ions Chemical class 0.000 abstract description 6
- 229910019142 PO4 Inorganic materials 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 abstract description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract description 4
- 239000010452 phosphate Substances 0.000 abstract description 4
- 230000007062 hydrolysis Effects 0.000 abstract description 3
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000007772 electrode material Substances 0.000 abstract description 2
- 238000002161 passivation Methods 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract 2
- 239000007787 solid Substances 0.000 description 6
- 238000009297 electrocoagulation Methods 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000003760 magnetic stirring Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000001112 coagulating effect Effects 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- JXBAVRIYDKLCOE-UHFFFAOYSA-N [C].[P] Chemical compound [C].[P] JXBAVRIYDKLCOE-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a solar electric flocculation sedimentation tank for enhancing the phosphorus removal function of rural sewage. Belongs to the cross field of rural sewage treatment and solar energy utilization; the invention comprises a solar cell panel, a pulse reversible electrode power controller, a water circulation type magnetized three-dimensional electrode electric flocculation tank device and a horizontal flow sedimentation tank; the invention is beneficial to reducing electrode passivation, improving current efficiency, enhancing mass transfer effect, promoting the reaction of dissolved iron ions and phosphate in sewage, improving dephosphorization effect and settling property of a sedimentation tank, promoting the full reaction of iron ions and hydrolysis products thereof and phosphate, improving the effective utilization rate of scrap iron, reducing the consumption of scrap iron in water treatment per ton and reducing the treatment cost; the cost of the soluble three-dimensional electrode material is low; the pulse electrification is adopted, so that the efficiency is high and the energy is saved; the electricity for the electric flocculation is used for solar photovoltaic power generation, and no power grid or electricity charge is needed, so that the method is green and pollution-free, and the treatment cost is reduced.
Description
Technical Field
The invention relates to the cross field of rural sewage treatment and solar energy utilization, in particular to a solar electric flocculation sedimentation tank for enhancing the rural sewage dephosphorization function.
Background
The eutrophication of water bodies faces serious water environment problems in various countries at present, and phosphorus is the most main control factor, so that the effective reduction of the phosphorus content in sewage becomes an important way for preventing the eutrophication of the water bodies.
At present, domestic sewage is commonly dephosphorized by biological phosphorus removal, but is limited by various conditions, such as low carbon-phosphorus ratio of sewage, influence of anaerobic environment caused by nitrate carried by return sludge in an anaerobic tank, phosphorus re-release of activated sludge in a secondary sedimentation tank and the like, and the discharge requirement that Total Phosphorus (TP) is lower than 0.5mg/L is difficult to be stabilized by effluent of biological phosphorus removal; adding a chemical phosphorus removal measure after the urban sewage treatment plant passes through a secondary sedimentation tank, and meeting the discharge requirement of TP by adopting a coagulating sedimentation method; but the coagulating sedimentation dephosphorization has the defects of increasing the occupied area, large investment, complex operation, low cleanness and the like, and is not suitable for rural domestic sewage treatment with the characteristics of wide range, dispersion, small scale, high fluctuation of water quality and water quantity of sewage and the like.
The patent (CN 205500868) designs a magnetic stirring three-dimensional electrode flocculation reactor, which is characterized in that: the upper part and the lower part in the electric flocculation reaction tank are respectively provided with a detachable polar plate clamping groove plate and a detachable three-dimensional electrode baffle plate, three-dimensional electrode fillers are arranged on the three-dimensional electrode baffle plates, a magnetic rotor is arranged between the three-dimensional electrode baffle plates and a bottom plate of the electric flocculation reaction tank, and a magnetic stirring motor is arranged in a magnetic stirring base; the electrocoagulation reaction tank is cuboid, and the length, width and height ranges are as follows: the length is 10-15 cm, the width is 10-15 cm, and the height is 15-20 cm; the utility model belongs to an experimental device, the shortcoming is not suitable for the actual sewage treatment of certain scale.
The patent (CN108585129A) discloses a three-dimensional electrode wastewater treatment method and equipment with recovery function, which comprises electrode preparation, a three-dimensional electrode electrolysis device and a magnet recovery device; the disadvantages are that: the particle electrode of the invention is complex to prepare, the magnet only recovers the electrode particles, and has no improvement effect on the electrolytic efficiency, and the invention has no electric flocculation effect and no removal effect on the phosphorus in the sewage.
Disclosure of Invention
Aiming at the problems, the invention provides the solar electric flocculation sedimentation tank for enhancing the rural sewage dephosphorization function, which can improve the sewage dephosphorization efficiency and reduce the operation cost.
The technical scheme of the invention is as follows: a solar energy electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function comprises a shed body (2), wherein a water circulation type magnetized three-dimensional electrode electric flocculation tank device (17) and a pulse reversible electrode power controller (13) which are mutually connected are arranged inside the shed body (2);
the water circulation type magnetized three-dimensional electrode electric flocculation tank device (17) comprises an electric flocculation tank (4) and a circulation groove (5) arranged at the water outlet end of the electric flocculation tank (4).
Furthermore, a plurality of cathode boxes (9) and anode boxes (10) which are arranged equally are arranged in the electric flocculation tank (4), and a water inlet (12) is formed in the electric flocculation tank (4);
a propeller (6) driven by direct current is arranged in the circulating tank (5), the propeller (6) is connected to a pulse reversible power supply controller (13) through a power supply cable,
a first overflow weir (11) is also arranged in the circulating tank (5),
and a guide plate (3) is fixedly arranged on the outer side of the circulating groove (5).
Furthermore, a horizontal flow type sedimentation tank (8) is arranged below the water circulation type magnetized three-dimensional electrode electro-flocculation tank device (17), and a flow guide baffle plate (7) is arranged at one end, close to the circulation tank (5), in the horizontal flow type sedimentation tank (8).
Furthermore, a second overflow weir (15) is arranged at one end of the horizontal sedimentation tank (8) opposite to the flow guide baffle (7),
a water outlet (16) of the advection type sedimentation tank (8) is also arranged on one side close to the overflow weir II (15).
Furthermore, a solar panel (1) is arranged on the top of the shed body (2),
and a storage battery (14) for supplying power to the pulse reversible power supply controller (13) is also arranged in the shed body (2), and the solar cell panel (1) is connected to the storage battery (14) through a lead.
Furthermore, one end of the guide plate (3) is vertically downwards opposite to the central line of the guide baffle (7);
the inclination angle of the guide plate (3) is-60 degrees, and the inclination angle of the guide baffle plate (7) is 45 degrees.
The invention has the beneficial effects that: (1) and the magnet is arranged below the scrap iron to carry out magnetization treatment on the scrap iron and the sewage, so that the electrode passivation is reduced, the current efficiency is improved, the mass transfer effect is enhanced, the reaction of dissolved iron ions and phosphate in the sewage is promoted, the phosphorus removal effect is improved, and the settling property of the settling pond is improved. Meanwhile, the iron filings can be prevented from being lost after the dissolved particle size is reduced; (2) the tail end of the electrocoagulation pool is provided with a circulating groove, and the sewage can be circulated for multiple times in the circulating groove to fully hydrolyze iron ions generated by electrocoagulation, so that the iron ions and hydrolysis products thereof are promoted to fully react with phosphate, the effective utilization rate of scrap iron is improved, the consumption of scrap iron in ton water treatment is reduced, and the treatment cost is reduced; (3) the effluent of the circulation tank enters a sedimentation tank in a free falling mode, so that dissolved oxygen is increased, the hydrolysis of residual iron ions is further promoted, a flocculating body is formed, and the sedimentation effect in the sedimentation tank is improved; (4) the scrap iron is a scrap iron processing material, has wide sources and low cost as a soluble three-dimensional electrode material; the pulse electrification is adopted, so that the efficiency is high and the energy is saved; the electricity for the electric flocculation is used for solar photovoltaic power generation, and no power grid or electricity charge is needed, so that the method is green and pollution-free, and the treatment cost is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a water circulation type magnetized three-dimensional electrode electric flocculation tank device in the invention;
FIG. 1 shows a solar panel; 2 is a shed body; 3 is a guide plate; 4 is an electric flocculation tank; 5 is a circulation tank; 6 is a propeller; 7 is a flow guide baffle; 8 is a horizontal flow sedimentation tank; 9 is a cathode can; 10 is an anode case; 11 is a first overflow weir; 12 is a water inlet, and 13 is a pulse reversible power supply controller; 14 is a storage battery; 15 is overflow weir II; 16 is a water outlet, and 17 is a water circulation type magnetized three-dimensional electrode electric flocculation tank device.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below; obviously, the following description is only a part of the embodiments, and it is obvious for a person skilled in the art to apply the technical solutions of the present invention to other similar situations without creative efforts; in order to more clearly illustrate the technical solution of the present invention, the following detailed description is made with reference to the accompanying drawings:
as shown in figures 1-2, a solar energy electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function, which comprises a shed body (2), wherein a water circulation type magnetized three-dimensional electrode electric flocculation tank device (17) and a pulse reversible pole power controller (13) which are mutually connected are arranged inside the shed body (2);
the water circulation type magnetized three-dimensional electrode electric flocculation tank device (17) comprises an electric flocculation tank (4) and a circulation groove (5) arranged at the water outlet end of the electric flocculation tank (4).
Furthermore, a plurality of cathode boxes (9) and anode boxes (10) which are arranged equally are arranged in the electric flocculation tank (4), and a water inlet (12) is formed in the electric flocculation tank (4);
a propeller (6) driven by direct current is arranged in the circulating tank (5), the propeller (6) is connected to a pulse reversible power supply controller (13) through a power supply cable,
a first overflow weir (11) is also arranged in the circulating tank (5),
and a guide plate (3) is fixedly arranged on the outer side of the circulating groove (5).
Furthermore, a horizontal flow type sedimentation tank (8) is arranged below the water circulation type magnetized three-dimensional electrode electro-flocculation tank device (17), and a flow guide baffle plate (7) is arranged at one end, close to the circulation tank (5), in the horizontal flow type sedimentation tank (8).
Furthermore, a second overflow weir (15) is arranged at one end of the horizontal sedimentation tank (8) opposite to the flow guide baffle (7),
a water outlet (16) of the advection type sedimentation tank (8) is also arranged on one side close to the overflow weir II (15).
Furthermore, a solar panel (1) is arranged on the top of the shed body (2),
and a storage battery (14) for supplying power to the pulse reversible power supply controller (13) is also arranged in the shed body (2), and the solar cell panel (1) is connected to the storage battery (14) through a lead.
Furthermore, one end of the guide plate (3) is vertically downwards opposite to the central line of the guide baffle (7);
the inclination angle of the guide plate (3) is-60 degrees, and the inclination angle of the guide baffle plate (7) is 45 degrees.
Preferably, the positive electrode and the negative electrode of the pulse reversible electrode controller (13) are respectively connected with an anode box (10) and a cathode box (9) in the electrocoagulation cell (17).
Further, the pulse reversible power supply controller (13) has a positive and negative reversing function and a pulse electrifying function;
the cathode box (9) and the anode box (10) are magnetized three-dimensional electrodes and are composed of conductive stainless steel mesh boxes, magnets and scrap iron. The assembling method comprises the following steps: the magnet is placed at the bottom of the conductive stainless steel net box, scrap iron is filled in the net box, the filling degree is 75%, the size of the stainless steel net box can be determined according to actual conditions, and the stainless steel net box is convenient to carry and mount; scrap iron is a waste material of metallic iron processing, such as cast iron scrap;
the number of magnetized three-dimensional electrode groups (one anode and one cathode are a group) of the electric flocculation tank (4) can be determined according to the scale of actual sewage treatment, the cathodes and the anodes are arranged in a staggered mode, and an anode cable and a cathode cable are connected to the output end of the pulse reversible electrode controller (13).
The method for applying the solar electric flocculation sedimentation tank to rural domestic sewage dephosphorization comprises the following steps:
step one, rural domestic sewage is delivered into a water inlet (12) through the effluent of a secondary sedimentation tank or a Membrane Bioreactor (MBR) of a biochemical treatment system, the hydraulic retention time of an electric flocculation tank (4) is controlled to be 20-40 min, a pulse reversible pole power supply controller (13) is turned on, the pulse power supply requirement is that the power supply is on for 4-8 min, then the power supply is off for 1min, the power supply is turned on for 4-8 min, the power supply is turned off for 1min again, and the process is circulated; controlling the current density to be 3-6A/m when the power is on2(ii) a Setting the time of inverting the anode (the anode is converted into the cathode, and the cathode is converted into the anode) to be 1-2 h;
step two, the sewage after the electric flocculation enters a circulating tank (5), the flow velocity of water in the circulating tank (5) is controlled by adjusting the rotating speed of a propeller (6), and the circulating frequency of the sewage in an electric flocculation tank (4) is controlled for 5-10 times; the sewage after the electric flocculation overflows to a guide plate (3) from a circulating tank (5), then freely falls to a guide baffle plate (7) in a horizontal flow sedimentation tank (8) and then enters the horizontal flow sedimentation tank (8);
thirdly, the surface load of the sewage in the horizontal flow type sedimentation tank (8) is 1-1.5 m3/m2H, the phosphorus-containing solid is settled in the horizontal flow type sedimentation tank (8) and then flows out of the horizontal flow type sedimentation tank (8) through the overflow weir II (15) and the water outlet (16).
Example 1: a solar electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function comprises a solar cell panel (1), a pulse reversible power supply controller (13), a water circulation type magnetized three-dimensional electrode electric flocculation tank device (17) and a horizontal sedimentation tank (8);
the solar cell panel (1) and the storage battery (14) are connected with the pulse reversible power supply controller (13) through leads; the positive electrode and the negative electrode of the pulse reversible electrode controller (13) are respectively connected with an anode box (10) and a cathode box (9) in the electric flocculation tank (4); the head end and the tail end of the circulating tank (5) are respectively communicated with the tail end and the head end of the electric flocculation tank (4), a direct-current driven propeller (6) is installed in the circulating tank (5), and a cable for supplying power to the propeller (6) is connected with a pulse reversible pole power supply controller (13); a guide plate (3) is fixed on the lower eave of a first overflow weir (11) on the circulating groove (5), and the inclination angle is-60 degrees; the tail end of the guide plate (3) is vertically downward opposite to a guide baffle (7) of a horizontal flow sedimentation tank (8), the guide baffle (7) is fixed on the wall of the sedimentation tank, and the inclination angle is minus 45 degrees; the overflow weir II (15) of the advection type sedimentation tank (8) is connected with the water outlet (16).
The method for removing the phosphorus from the rural domestic sewage by using the device comprises the following steps:
step one, rural domestic sewage is delivered into a water inlet (12) through effluent of a secondary sedimentation tank of a biochemical treatment system, the hydraulic retention time of an electric flocculation tank (4) is controlled to be 20min, a pulse reversible pole power supply controller (13) is turned on, the pulse power supply requirement is that the power is supplied for 4min, then the power is cut off for 1min, the power is supplied for 4min again, the power is cut off for 1min again, and the process is circulated; controlling the current density at 3A/m when electrifying2(ii) a Setting the time of inverting the anode (the anode is converted into the cathode, and the cathode is converted into the anode) to be 2 h;
step two, the sewage after the electric flocculation enters a circulating tank (5), the flow rate of water in the circulating tank (5) is controlled by adjusting the rotating speed of a propeller (6), and the circulating frequency of the sewage in an electric flocculation tank (4) is controlled for 5 times; the sewage after the electric flocculation overflows to the guide plate (3) from the circulating tank (5), then freely falls to a guide baffle plate (7) in the horizontal flow sedimentation tank (8) and then enters the horizontal flow sedimentation tank (8).
Thirdly, the surface load of the sewage in the horizontal flow type sedimentation tank (8) is 1-1.5 m3/m2H, settling the phosphorus-containing solid in the horizontal flow type sedimentation tank (8), and then enabling the phosphorus-containing solid to flow out of the horizontal flow type sedimentation tank (8) through a second overflow weir (15) and a water outlet (16);
after the phosphorus-containing sewage is treated by the method, the total phosphorus concentration in the sewage can be reduced to below 1.0mg/L from 3 mg/L.
Example 2: a solar electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function comprises a solar cell panel (1), a pulse reversible power supply controller (13), a circulating type magnetized three-dimensional electrode electric flocculation tank (4) and a horizontal flow sedimentation tank (8);
the solar cell panel (1) and the storage battery (14) are connected with the pulse reversible power supply controller (13) through leads; the positive electrode and the negative electrode of the pulse reversible electrode controller (13) are respectively connected with an anode box (10) and a cathode box (9) in the electric flocculation tank (4); the head end and the tail end of the circulating tank (5) are respectively communicated with the tail end and the head end of the electric flocculation tank (4), a direct-current driven propeller (6) is arranged in the circulating tank (5), and a cable for supplying power to the propeller (6) is connected with a pulse reversible pole power supply controller (13); a guide plate (3) is fixedly connected with the lower eave of the overflow weir I (11) arranged on the circulating groove (5), and the inclination angle of the guide plate is-60 degrees; the tail end of the guide plate (3) is vertically downward and directly opposite to a guide baffle (7) above the horizontal flow type sedimentation tank (8), the guide baffle (7) is fixed on the wall of the horizontal flow type sedimentation tank (8), and the inclination angle is minus 45 degrees; the second overflow weir (15) arranged on the horizontal sedimentation tank (8) is connected with the water outlet (16).
The method for removing the phosphorus from the rural domestic sewage by using the device comprises the following steps:
step one, rural domestic sewage is treated by a Membrane Bioreactor (MBR) and then is sent to a water inlet (12), the hydraulic retention time of an electric flocculation tank (4) is controlled to be 30min, a pulse reversible pole power supply controller (13) is turned on, the pulse power supply requirement is that the power is supplied for 6min, then the power is cut off for 1min, then the power is supplied for 6min, then the power is cut off for 1min, and the like is circulated; controlling the current density at 4A/m when the power is on2(ii) a Setting the time of the reversed pole (the positive pole is converted into the negative pole, and the negative pole is converted into the positive pole) to be 1.5 h;
step two, the sewage after the electric flocculation enters a circulating tank (5), the flow rate of water in the circulating tank (5) is controlled by adjusting the rotating speed of a propeller (6), and the circulating frequency of the sewage in an electric flocculation tank (4) is controlled for 8 times; the sewage after the electric flocculation overflows to the guide plate (3) from the circulating tank (5), then freely falls to the guide baffle plate (7) and then enters the advection type sedimentation tank (8);
thirdly, the surface load of the sewage in the horizontal flow type sedimentation tank (8) is 1-1.5 m3/m2H, the phosphorus-containing solid is settled in the horizontal flow type sedimentation tank (8) and then flows out of the horizontal flow type sedimentation tank (8) through the overflow weir II (15) and the water outlet (16).
After the phosphorus-containing sewage is treated by the method, the total phosphorus concentration in the sewage can be reduced to be below 0.5mg/L from 3 mg/L.
Example 3: a solar electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function comprises a solar cell panel (1), a pulse reversible power supply controller (13), a circulating type magnetized three-dimensional electrode electric flocculation tank (4) and a horizontal flow sedimentation tank (8);
the solar cell panel (1) and the storage battery (14) are connected with the pulse reversible power supply controller (13) through leads; the positive electrode and the negative electrode of the pulse reversible electrode controller (13) are respectively connected with an anode box (10) and a cathode box (9) in the electric flocculation tank (4); the head end and the tail end of the circulating tank (5) are respectively communicated with the tail end and the head end of the electric flocculation tank (4), a direct-current driven propeller (6) is arranged in the circulating tank (5), and a cable for supplying power to the propeller (6) is connected with a pulse reversible pole power supply controller (13); a guide plate (3) is fixed on the lower eave of a first overflow weir (11) on the circulating groove (5), and the inclination angle is-60 degrees; the tail end of the guide plate (3) is vertically downward opposite to the guide baffle (7), the guide baffle (7) is fixed on the wall of the horizontal flow sedimentation tank (8), and the inclination angle is minus 45 degrees; the second overflow weir (15) arranged on the horizontal sedimentation tank (8) is connected with the water outlet (16).
The method for removing the phosphorus from the rural domestic sewage by using the device comprises the following steps:
step one, rural domestic sewage is delivered into a water inlet (12) through the effluent of a secondary sedimentation tank or a Membrane Bioreactor (MBR) of a biochemical treatment system, the hydraulic retention time of an electrocoagulation tank (4) is controlled to be 40min, a pulse reversible pole power supply controller (13) is turned on, the pulse power supply requirement is that the power is supplied for 8min, then the power is cut off for 1min, then the power is supplied for 8min, then the power is cut off for 1min, and then the power is supplied for 1min, and the power is cut off again; controlling the current density at 4A/m when the power is on2(ii) a Setting the time of inverting the anode (the anode is converted into the cathode, and the cathode is converted into the anode) to be 1 h;
step two, the sewage after the electric flocculation enters a circulating tank (5), the flow rate of water in the circulating tank (5) is controlled by adjusting the rotating speed of a propeller (6), and the circulating frequency of the sewage in an electric flocculation tank (4) is controlled for 10 times; the sewage after the electric flocculation overflows to the guide plate (3) from the circulating tank (5), then freely falls to the guide baffle plate (7) and then enters the advection type sedimentation tank (8);
thirdly, the surface load of the sewage in the horizontal flow type sedimentation tank (8) is 1-1.5 m3/m2H, settling the phosphorus-containing solid in the horizontal flow type sedimentation tank (8), and then enabling the phosphorus-containing solid to flow out of the horizontal flow type sedimentation tank (8) through a second overflow weir (15) and a water outlet (16);
after the phosphorus-containing sewage is treated by the method, the total phosphorus concentration in the sewage can be reduced to be below 0.2mg/L from 3 mg/L.
Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of embodiments of the present invention; other variations are possible within the scope of the invention; thus, by way of example, and not limitation, alternative configurations of embodiments of the invention may be considered consistent with the teachings of the present invention; accordingly, the embodiments of the invention are not limited to the embodiments explicitly described and depicted.
Claims (6)
1. A solar energy electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function is characterized by comprising a shed body (2), wherein a water circulation type magnetized three-dimensional electrode electric flocculation tank device (17) and a pulse reversible electrode power controller (13) which are mutually connected are arranged inside the shed body (2);
the water circulation type magnetized three-dimensional electrode electric flocculation tank device (17) comprises an electric flocculation tank (4) and a circulation groove (5) arranged at the water outlet end of the electric flocculation tank (4).
2. The solar energy electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function according to claim 1, wherein a plurality of equally-arranged cathode boxes (9) and anode boxes (10) are arranged inside the electric flocculation tank (4), and a water inlet (12) is formed on the electric flocculation tank (4);
a propeller (6) driven by direct current is arranged in the circulating tank (5), the propeller (6) is connected to a pulse reversible power supply controller (13) through a power supply cable,
a first overflow weir (11) is also arranged in the circulating tank (5),
and a guide plate (3) is fixedly arranged on the outer side of the circulating groove (5).
3. The solar energy electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function according to claim 1, wherein a horizontal flow type sedimentation tank (8) is arranged below the water circulation type magnetized three-dimensional electrode electric flocculation tank device (17), and a flow guide baffle (7) is arranged at one end of the horizontal flow type sedimentation tank (8) close to the circulation tank (5).
4. The solar energy electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function according to claim 3, wherein a second overflow weir (15) is arranged at the end opposite to the flow guide baffle (7) in the horizontal sedimentation tank (8),
a water outlet (16) of the advection type sedimentation tank (8) is also arranged on one side close to the overflow weir II (15).
5. The solar electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function according to claim 1, wherein a solar cell panel (1) is installed on the top of the shed body (2),
and a storage battery (14) for supplying power to the pulse reversible power supply controller (13) is also arranged in the shed body (2), and the solar cell panel (1) is connected to the storage battery (14) through a lead.
6. The solar electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function according to claims 1 and 3, characterized in that: one end of the guide plate (3) is vertically and downwards opposite to the central line of the guide baffle (7);
the inclination angle of the guide plate (3) is-60 degrees, and the inclination angle of the guide baffle plate (7) is 45 degrees.
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| CN202010952225.2A CN112358013A (en) | 2020-09-11 | 2020-09-11 | Solar electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function |
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| CN202010952225.2A CN112358013A (en) | 2020-09-11 | 2020-09-11 | Solar electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function |
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| CN112358013A true CN112358013A (en) | 2021-02-12 |
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| CN202010952225.2A Pending CN112358013A (en) | 2020-09-11 | 2020-09-11 | Solar electric flocculation sedimentation tank for enhancing rural sewage dephosphorization function |
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Cited By (1)
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| WO2024016943A1 (en) * | 2022-07-21 | 2024-01-25 | 宁波市思虎电子科技有限公司 | Electrode reversing method of unstable power supply-based electrode device |
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